Fosinopril

What is Fosinopril?

Fosinopril is an oral medication belonging to a class of drugs called ACE inhibitors (angiotensin-converting enzyme inhibitors). It is primarily prescribed to treat high blood pressure and heart failure by helping blood vessels relax and reducing the workload on the heart. Fosinopril is unique among ACE inhibitors because it is eliminated equally through both the kidneys and liver, making it suitable for patients with kidney problems.

Uses

Fosinopril is approved and commonly used for several cardiovascular conditions:

High blood pressure (hypertension): The primary use of fosinopril is to lower blood pressure in adults, either as a single medication or combined with other blood pressure drugs like diuretics.

Heart failure: It helps improve symptoms and reduce hospitalizations in patients with heart failure by decreasing the heart’s workload and improving blood flow.

Submit Your Paper

Protection after heart attack: Fosinopril may be prescribed following a heart attack to help protect heart function and reduce the risk of future cardiovascular events.

Kidney protection in diabetes: In diabetic patients, fosinopril can help slow the progression of kidney disease by reducing pressure in the kidney’s blood vessels.

Left ventricular dysfunction: It is used to treat patients with reduced heart pumping function, even when they don’t yet have symptoms of heart failure.

How it works

Fosinopril blocks the action of angiotensin-converting enzyme (ACE), which normally converts a hormone called angiotensin I into angiotensin II. Angiotensin II causes blood vessels to narrow and triggers the release of hormones that increase blood pressure and fluid retention. By blocking this process, fosinopril allows blood vessels to relax and widen, reducing blood pressure and making it easier for the heart to pump blood throughout the body.

Side effects

Common side effects include:

• Dry cough (occurs in 10-15% of patients)
• Dizziness or lightheadedness
• Headache
• Fatigue or weakness
• Nausea
• Diarrhea
• Muscle pain
• Low blood pressure

Serious side effects requiring immediate medical attention:

• Severe allergic reactions with swelling of face, lips, tongue, or throat
• Signs of high potassium levels (irregular heartbeat, muscle weakness)
• Kidney problems (decreased urination, swelling in legs or feet)
• Severe drop in blood pressure causing fainting
• Liver problems (yellowing of skin or eyes, dark urine)

Warnings and precautions

Pregnancy: Fosinopril can cause serious harm to developing babies and should not be used during pregnancy, especially in the second and third trimesters. Women who become pregnant while taking fosinopril should contact their doctor immediately.

Kidney and liver disease: While fosinopril is safer than other ACE inhibitors for patients with kidney problems, regular monitoring of kidney and liver function is still necessary during treatment.

High potassium levels: Fosinopril can cause potassium levels to rise, which can be dangerous for the heart. Patients should have regular blood tests to monitor potassium levels.

Dehydration and surgery: Patients should inform healthcare providers about fosinopril use before surgery or if they become dehydrated, as this can lead to dangerous drops in blood pressure.

Elderly patients: Older adults may be more sensitive to the blood pressure-lowering effects and may need lower starting doses.

Interactions

Potassium supplements and salt substitutes: These can increase potassium levels to dangerous heights when combined with fosinopril.

NSAIDs (ibuprofen, naproxen): These pain relievers can reduce fosinopril’s effectiveness and increase the risk of kidney problems.

Lithium: Fosinopril can increase lithium levels in the blood, potentially leading to lithium toxicity.

Diuretics: Combining with water pills can cause excessive drops in blood pressure, especially when starting treatment.

Diabetes medications: ACE inhibitors may enhance the blood sugar-lowering effects of diabetes drugs, increasing the risk of low blood sugar.

Aliskiren: This blood pressure medication should not be used with fosinopril in patients with diabetes or kidney problems.

Trimethoprim/sulfamethoxazole: This antibiotic combination can increase potassium levels when used with fosinopril.

Check interactions with the GMJ Interaction Checker

Dosage

For high blood pressure: The typical starting dose is 10 mg once daily, which may be increased to 20-40 mg daily based on blood pressure response. The maximum recommended dose is 80 mg daily.

For heart failure: Treatment usually begins with 10 mg once daily, with gradual increases up to 40 mg daily as tolerated.

Dosages should always be individualized based on patient response, other medications, and underlying health conditions. Your healthcare provider will determine the most appropriate dose and may adjust it over time based on your blood pressure readings and overall response to treatment.

Sources: FDA DailyMed drug labels (public domain), BNF, WHO Essential Medicines List. This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting or stopping any medication.

This work is licensed under Creative Commons Attribution 4.0 International (CC BY 4.0). You are free to share and adapt this content with attribution to GMJ News (news.gmj.ge).